"Let's see. There are monkeys that evolved into men and monkeys that didn't. Just as well, there are men that remained men and men that evolved into something else. Do you really think humans are the ultimate form of evolution? How arrogant."
--Kakurine, Evil Zone for PS1

I think overall green might be better if only because you don't similar to a fire mage. The color is a bit more unique in that sense, though I expect some form of glyph to change it back to red to come around at some point if it isnt already on the ptr or something.

I have two specs, and neither of them are Destruction. I'm not going to be in any hurry to get the green fire. It's not necessary, and I never understood how fervently the Warlock community pushed for this.

"Video games only exist, so that idiots have something to be good at" - Joe Hildebrand
"Nothing is too trivial to be a problem for a social justice warrior, because they don't like to deal with real problems." - Professor Jordan B. Peterson.

the warlock in my guild explained to me that it was a running joke in the warlock forums a couple of years ago
Had something to do with them wanting to fix their class and blizzard sugessting a visual update of the firespells instead

So it ended up in "yay, our class sucks, but we are getting green fire!!11"

"And all those exclamation marks, you notice? Five?
A sure sign of someone who wears his underpants on his head."